Simple se ideas - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Thread Tools Search this Thread
Old 6th September 2011, 02:59 PM   #1
diyAudio Member
Join Date: Sep 2006
Default Simple se ideas

Hi all,

I have had some simple se boards I have ordered from George sitting in my study for a while and have decided to get motivated and start building.

I need to order everything except for those impossible to get 'transistors' I have successfully built a few pcb based tube amps now and want to go a bit further with this one.

My idea is to use the new kt120 tube driven pretty much to maximum dissipation and I'm hoping to get 20 or more watts in ultralinear mode using diode rectification only.

I would like to use one of the antek toridal power transformers and wanted to get some opinions on what the absolute maximum voltage I could apply to the board would be I'm quiet aware that I would need to series up power supply caps if the rectified voltage gets to be more than 500 but unsure if any resistance values should change for the driver tubes.
Or weather sticking to the max recommended 400-0-400 would be the go

For the outputs triode store has a pretty good looking 30w single ended ultralinear transformer 2.5k or using different tappings 5k I was thinking this would be pretty good configured to use it as 2.5k

Just wanted to throw some ideas around and see what people thought.


Ps I have accidentally posted this to the main forum and can't seem to delete it
  Reply With Quote
Old 6th September 2011, 09:00 PM   #2
rknize is offline rknize  United States
diyAudio Member
rknize's Avatar
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
I don't think is a practical limit to the PCB itself. You'd want to check the working voltages of R2 and R4. You also might want to increase the values of R14/24 to take some of the thermal stress off of the CCS (you can also increase the size of their heatsinks). That's all I can think of off the top of my head.
  Reply With Quote
Old 7th September 2011, 03:47 AM   #3
Jpeg is offline Jpeg  United States
diyAudio Member
Join Date: Dec 2010
Location: Akron Ohio
Default This Idea Keeps Popping up.

I don't know if you saw them, but there are at least 2 threads on this already.

Simple SE with kt120?

Simple SE with KT120s

I have to admit that this idea has been rattling around in my head ever since I got my grubby hands on a pair of Edcor's mamoth single-ended output transformers. ( EDCOR Electronics Corporation. CXSE25-8-5K I have been listening to it's 3.2k brother for the last week on 2a3s and 300b's and they sound very nice especially for the price. I am not sure what the ideal plate load would be for a KT120, I would do more research before moving forward) That, or taking two simple SE boards and making SE monoblocks with 2 Kt88 or EL34's per channel. From these threads it sounds like two of the biggest challenges will be finding caps that will take that much voltage, and keeping octal base sockets from arcing. Of course there is always the danger of the kt120 not catching on, and spending a lot of time and money on an orphan amp. And I agree with George, get the amp running first, then put in the KT120, then turn up the voltage, there would be too many variables otherwise. I would love to see someone actually build one. Hmmm, I do have a simple SE board just laying around...
  Reply With Quote
Old 9th September 2011, 12:06 AM   #4
diyAudio Member
Join Date: Dec 2008
Location: Victoria, BC
Originally Posted by gazzgary View Post
I need to order everything except for those impossible to get 'transistors' ........

What are those? I have a simple SE board and a few parts in a box here -unbuilt- and just assumed I could easily source more parts if needed.
  Reply With Quote
Old 9th September 2011, 01:31 AM   #5
rknize is offline rknize  United States
diyAudio Member
rknize's Avatar
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Probably the CCS. You might try hitting up Pete Millett. He bought a bunch to ship to overseas folks that can't get them. It's mainly for his "red board", but he'll probably sell them to whomever.
  Reply With Quote
Old 9th September 2011, 01:56 AM   #6
diyAudio Member
deadpool's Avatar
Join Date: Jul 2009
Location: Melbourne
Just an idea, how about sourcing iron from...

Audio Catalog

I used the Mars iron and its very well priced to get to Australia and sounds good too
'Beauty is the promise of happiness'
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tubelab SE vs Simple SE Pez Tubelab 25 29th October 2011 02:16 AM
Tubelab simple SE ideas gazzgary Tubelab 2 7th September 2011 04:18 PM
Simple SE Simple Power Drive? Skorpio Tubelab 1 5th May 2011 09:45 AM
Tubelabs SE vs. Simple SE ?? albireo13 Tubelab 16 21st February 2010 09:00 PM
simple box ideas? ThyDntWntMusic Multi-Way 12 27th May 2008 11:39 AM

New To Site? Need Help?

All times are GMT. The time now is 03:55 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2